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We Treat Your Brand
Like Our Own
The expertise of a specialist. The alignment of an in-house team. We are your dedicated email department.
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Specialists,
Not Generalists
We founded CartStrings on a single premise: Mastery requires focus.
Modern e-commerce email is no longer just about sending newsletters. It is a complex ecosystem of data, behavioral logic, and retention strategy. To get it right, you can't be a generalist. You have to be an engineer.
We chose to do one thing—Email Marketing for E-commerce—so we could be the absolute best in the world at it
Our mission is simple: To turn your email list into your most predictable, high-margin revenue channel. We build the strategy, execute the creative, & manage the technical infrastructure so you can focus on withdrawing the funds.
The In-House Feel
True partnership means zero friction. We don't hide behind support tickets or wait for instructions. We integrate into your workflow to learn your brand from the inside out. We align our goals with yours and celebrate your wins as our own. When you hire CartStrings, you aren't outsourcing a task. You are acquiring a partner that cares about your bottom line as much as you do.
Our Guiding Principles
Dictates Design
Like Owners
Trusted by Leading
E-commerce Brands
Meilech Biller
Meilech built CartStrings to solve the biggest problem in the agency world: The Bait-and-Switch.
Most agencies sell you the CEO, then hand your account to a junior manager. That doesn't happen here. Meilech is an operator, not a figurehead. He personally oversees every client relationship, ensuring the strategy you signed up for is exactly what is delivered.
No "B-Team." No middlemen. Just direct access to the expert you hired.
Our Experts
Meet the skilled professionals driving innovation and delivering exceptional results.
Designs that don't just look good—they convert.
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Turns passive scrollers into active buyers.
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Architects the technical logic that drives revenue.
About CartStrings FAQ
Who is CartStrings?
CartStrings is an e-commerce email marketing agency for Shopify brands, founded by Meilech Biller. The team owns email and SMS lifecycle work—executed in Klaviyo—so established ecommerce brands get specialist execution without hiring a full in-house retention squad.
What is retention marketing for ecommerce?
Retention marketing is the email and SMS program that turns one-time buyers into repeat customers — welcome, cart and browse recovery, post-purchase, winback, and campaigns — usually run in Klaviyo for Shopify stores. It is separate from paid acquisition.
Why specialize in Klaviyo and Shopify?
Klaviyo plus Shopify is where most of CartStrings’ ICP already runs retention data and consent. Specializing there keeps recommendations practical: events, flows, deliverability, and list health that match how those stores actually sell.
Free audit vs hiring CartStrings — what’s the difference?
The Free Klaviyo Audit is a diagnostic: findings and a clear fix order. Hiring CartStrings means ongoing ownership of flows, campaigns, and related retention work after fit is confirmed. You can use the audit alone or as the on-ramp to a retainer.
Let’s build email marketing that feels like it was done in-house.